2 sentences

1. 他正在给汽车换机油。

   tā zhèng​zài gěi qì​chē huàn jī​yóu.

   He is changing the motor oil for the car.

   Source: Dong Chinese Dictionary

2. 你今早给车换机油了吗？

   nǐ jīn​zǎo gěi chē huàn jī​yóu le ma?

   Did you change the oil in the car this morning?

   Source: OpenSubtitles